Cecil Moore wrote:

...
It does if we know the reflected wave undergoes a
180 degree round-trip phase shift or else the
reflected wave would not be in phase with the
forward wave and therefore the feedpoint impedance
would not be purely resistive.
...


Or, to sum that up in a nut shell, "Does everyone here know we can
reverse the leads on our SWR meter (input goes to output--output goes to
input) and the fwd/ref switch will just work "backwards." (but, readings
should remain the same.)

Indeed, an excellent way to check homebuilt SWR bridges and make sure
they are "balanced."

Regards,
JS